Física de la Matèria Condensada: Enviaments recents
Ara mostrant els elements 101-120 de 1286
Collaborative coupling between polymerase and helicase for leading-strand synthesis
Rapid and processive leading-strand DNA synthesis in the bacteriophage T4 system requires functional coupling between the helicase and the holoenzyme, consisting of the polymerase and trimeric clamp loaded by the clamp ...
Mean first-passage times for systems driven by gamma and McFadden dichotomous noise
We consider mean first-passage times (MFPTs) for systems driven by non-Markov gamma and McFadden dichotomous noises. A simplified derivation is given of the underlying integral equations and the theory for ordinary renewal ...
On the effect of magnetic interaction in barium hexaferrite particles
The effect of interactions on the magnetic relaxation of nanocrystalline hexagonal barium hexaferrite BaFe10.4Co0.8Ti0.8O19 is discussed. We had previously shown that according to the T ln(t/τ0) scaling, an enhancement of ...
Active fingering instability in tissue spreading
During the spreading of epithelial tissues, the advancing tissue front often develops fingerlike protrusions. Their resemblance to traditional viscous fingering patterns in driven fluids suggests that epithelial fingers ...
Graphene-based autonomous pyroelectric system for near-field energy conversion
In the close vicinity of a hot solid, at distances smaller than the thermal wavelength, a strong electromagnetic energy density exists because of the presence of evanescent field. Here we introduce a many-body conversion ...
Stochastic semiclassical gravity
In the first part of this paper, we show that the semiclassical Einstein-Langevin equation, introduced in the framework of a stochastic generalization of semiclassical gravity to describe the back reaction of matter ...
Shot-noise suppression by Fermi and Coulomb correlations in ballistic conductors
We investigate the injection of degenerate Fermi-Dirac electrons into a multimode ballistic conductor under the space-charge limited regime. The nonequilibrium current fluctuations were found to be suppressed by both Coulomb ...
Generation of uncorrelated random scale-free networks
Uncorrelated random scale-free networks are useful null models to check the accuracy and the analytical solutions of dynamical processes defined on complex networks. We propose and analyze a model capable of generating ...
Particle creation due to cosmological contraction of extra dimensions
Particle production in a cosmological spacetime with extra dimensions is discussed. A five-dimensional cosmological model with a three-dimensional space expanding isotropically like in a radiative Friedmann-Robertson-Walker ...
Microscale magneto-elastic composite swimmers at the air-water and water-solid interfaces under a uniaxial field
Self-propulsion of magneto-elastic composite microswimmers is demonstrated under a uniaxial field at both the air-water and the water-substrate interfaces. The microswimmers are made of elastically linked magnetically hard ...
Free energy of critical droplets—from the binodal to the spinodal
Arguably, the main challenge of nucleation theory is to accurately evaluate the work of formation of a critical embryo in the new phase, which governs the nucleation rate. In Classical Nucleation Theory (CNT), this work ...
Magnetism of isolated Mn12 single-molecule magnets detected by magnetic circular dichroism: Observation of spin tunneling with a magneto-optical technique
We report magnetic and magneto-optical measurements of two Mn12 single-molecule magnet derivatives isolated in organic glasses. Field-dependent magnetic circular dichroism (MCD) intensity curves (hysteresis cycles) are ...
Reversible colossal barocaloric effects near room temperature in 1-X-adamantane (X=Cl, Br) plastic crystals
Plastic crystals undergo phase transitions with unusually large volume and entropy changes related to strong molecular orientational disordering. These features have led to a resurgent interest in these materials because ...
Computer simulation study of liquid lithium at 470 and 843 K
Both structural and dynamical properties of 7Li at 470 and 843 K are studied by molecular dynamics simulation and the results are comapred with the available experimental data. Two effective interatomic potentials are used, ...
Quantum and random walks as universal generators of probability distributions
Quantum walks and random walks bear similarities and divergences. One of the most remarkable disparities affects the probability of finding the particle at a given location: typically, almost a flat function in the first ...
Interaccion among systems of finite size in predictive relativistic mechanics I. General framework
We derive a Hamiltonian formulation for the three-dimensional formalism of predictive relativistic mechanics. This Hamiltonian structure is used to derive a set of dynamical equations describing the interaction among systems ...
Effect of a transverse magnetic field on resonant magnetization tunneling in high-spin molecules
The recent observation of steps at regular intervals of magnetic field in the hysteresis loops of oriented crystals of the spin-10 molecular magnet Mn12O12(CH3COO)16(H2O)4 has been attributed to resonant tunneling between ...
Kinetic growth of field-oriented chains in dipolar colloidal solutions
Experimental studies on the irreversible growth of field-induced chains of dipolar particles suggest an asymptotic power-law behavior of several relevant quantities. We introduce a Monte Carlo model of chain growth that ...
Ressenya: Sidereus Nuncius. O Mensageiro das Estrelas de Galileu Galilei. Tradução, estúdio e notas por Henrique Leitão
Acaba d"aparèixer març de 2010 de la mà d"Henrique Leitão, la primera traducció realitzada a Portugal del Sidereus Nuncius. O Mensageiro das Estrelas , de Galileo Galilei, editat per la Fundació Calouste Gulbenkian, en ...
Vortex state and effect of anisotropy in sub-100 nm magnetic nanodots
Magnetic properties of Fe nanodots are simulated using a scaling technique and Monte Carlo method, in good agreement with experimental results. For the 20-nm-thick dots with diameters larger than 60¿nm, the magnetization ...
